Abstract : The purpose of this study is to explore the acculturating features of some teaching practices using youth literature in the 1st year. Reinforced by the research LireÉcrireCP, it compares the practices of two different groups of classes of different efficiency within a quantitative approach without impact on the teachers’ practices. Three different types of practice are studied in this research: the reading by the teacher for pupils, the lessons of text exploration, and the implementation of a library within the classroom. In our study, according to the LireÉcrireCP research, 15 classes are recognised as the most efficient ones, and 15 others as the less efficient ones. The efficiency is assessed according to the progression made by the pupils attributable only to the teacher, so-called the teacher’s effect. This progression is assessed at the beginning and at the end of the school year. In contrast with the less efficient group of classes, the results observed in the most efficient group of class show that the investigated practices help to develop and cultivate reading for personal purpose of pupils. The acculturation is therefore characterised by the implementation of rituals featuring the cultural practice of reading for personal purpose with its three indissociable components: subjective, sociable, and cognitive. The study is extended by an investigation of the teachers’ practices within the most efficient groups. It highlights that shaping of the pupils’ activity is ensured by a strong scaffolding of the pupils by the teacher. This scaffold must rest upon the acting, on the reification, and on the verbalisation. Lastly, the analysis of the language’s scaffold shows that in these classes, the oral activity that complements the reading of youth literature is particularly thinking demanding and depends on the supporting skills of the teacher for the construction of the point of view where reformulating and structuring the pupil’s speech are essential.